Could you explain why?
Procmail is an MDA which provides filtering.
Exim does not need an MDA and has its own user-level filtering. For example here's the filter for this list:
# Debian-user if $h_List-ID: contains "<debian-user.lists.debian.org>" then save Mail/debian-user endif
-- Steve C. Lamb | I'm your priest, I'm your shrink, I'm your PGP Key: 8B6E99C5 | main connection to the switchboard of souls. -------------------------------+---------------------------------------------
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